i want to create a button to start putty session from html page

So by default Putty doesn't have any URI's associated with it - I'm talking about the part that makes external applications launch..

ftp://
skype://
itunes:// 

So you need to add the protocol to windows registry (the button will only work on the machine you do this on)..

Here's a great tutorial of how to do this: Launch PuTTY from Your Browser – Adding Procotols to Windows[^]


In short, this is what you do:

1. Register a new protocol (in our case, let’s call it “ssh”) to Windows’s registry.
2. Create a batch file that can take in strings such as “ssh://google.com” and massage them and pass them on to putty.exe
3. Point the registry modification to that batch file.

Step 1 - the .reg file, save it as putty.reg, right click it and select merge

REGEDIT4
[HKEY_CLASSES_ROOT\ssh]
@="URL:ssh Protocol"
"URL Protocol"=""
[HKEY_CLASSES_ROOT\ssh\shell]
[HKEY_CLASSES_ROOT\ssh\shell\open]
[HKEY_CLASSES_ROOT\ssh\shell\open\command]
@="\"C:\\putty_util.bat\" %1"

Note: change the putty_util.bat location to where-ever you make your .bat (batch file)

Step 2 - the putty_util.bat file, save it in the location you specified in the .reg file

@echo off
set var=%1
set extract=%var:~6,-1%
"C:\Program Files\PuTTY\putty.exe" %extract%

Try launch a ssh:// link from your browser and see if putty launches